Hi @Khammampati Surendra
On top of @Laurie Sciutti 's advice, a couple of practical things, especially if you have apps that modify your content.
If it's Server to Cloud migration, check with the app vendor if their apps are migration compatible between the platforms. Some are, some not, in which case they often provide a workaround. Be prepared that not everything will be the same and don't forget that migrating to a different CMS would be MUCH worse :)
Eensure that your target setup is identical to the source setup in terms of permissions, apps, settings, etc. Cloud to Cloud should be easy, Server to Cloud, not that much different.
Migrations are an EXCELLENT opportunity to review and cleanup your content in the Source Confluence, whether Cloud or Server (in which case you may wanna simplify the content to make it more compatible with the Cloud environment.
Create your checklist - for both the source and the target and go over it multiple times, doublechecking everything. Your settings, your apps, your apps settings, your users, permissions.
TEST. TWICE :) Start with smaller spaces (or sections of the spaces) that are representative of your content. See what went well and what not so much.
Typically, you don't need third party tools unless you have some heavy customization going on, in which case, there are professional Atlassian partnes who help clients handle migrations (for a fee, of course, but it can save you a lot of time and nerves).
The only third-party tools that are typically needed are 'in-between apps' that marketplace vendors created to handle Server(DC) to Cloud migrations.
Hope this help :)
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